Chapter
Apr 26, 2012
Neutral Plane Solution for Liquefaction-Induced Down-Drag on Vertical Piles
Authors: Ross W. Boulanger and Scott J. BrandenbergAuthor Affiliations
Publication: Geotechnical Engineering for Transportation Projects
Abstract
Down-drag loads on pile foundations can be an important design consideration when earthquake-induced liquefaction is expected to cause ground settlements. A modified neutral plane solution for liquefaction-induced down-drag on vertical piles is described that accounts for the variation in excess pore pressures and ground settlements over time as a liquefied layer reconsolidates, the dependence of sand compressibility on excess pore pressure ratio, and the dependence of shaft skin friction on the excess pore pressure ratio. A worked example illustrates the role of various parameters on peak pile loads and settlements. The modified solution predicts substantially smaller pile settlements than obtained from a traditional neutral plane solution for end-of-consolidation conditions. Recommendations for design practice are presented.
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© 2004 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering mechanics
- Foundation design
- Foundation settlement
- Foundations
- Geomechanics
- Geotechnical engineering
- Pile foundations
- Pile settlement
- Pore pressure
- Pressure (type)
- Soil dynamics
- Soil liquefaction
- Soil mechanics
- Soil pressure
- Soil properties
- Soil settlement
- Solid mechanics
Authors
Affiliations
Ross W. Boulanger
M.ASCE
Professor, Department of Civil and Environmental Engineering, University of California, Davis, CA, 95616
Scott J. Brandenberg
A.M.ASCE
Graduate student, Researcher, Department of Civil and Environmental Engineering, University of California, Davis, CA, 95616
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